Centrifugal governor



Dec. 16, 1930. J. H. ROBERTSON 3 CENTRIFUGAL GOVERNOR Filed July 7,1.928

Patented Dec. 16, 1930 1 1 UNITED STATES.

PAT NT ,OFFIc Y L n onnnoee nonnnrson, orizonn'on, ENGLAND cnn'rnirneAreovnnivon Application filed J1 11y (,*1928 Serial No. 291,1 21, and inGreat BritainiApri l 10, 1928 This invention relates to centrifugalgovernors. The invention has for its object'to provide an improvedgovernor mechanism" adapted to control the relative position or angularrelation of'two or mo-rerotaryparts, morees'pecially in connectionwith-variable friction gear of thekind in which one memher is displacedaxially in accordance with its-speed of rotation: 1

According to this invention,- themecha nism'comprisesi'a disc, casing orother support driven by the governor shaft or the like, in or upon whichsupport there ismounted a ring orother-part' capable of'rotation ijnj 15relation to the said support; The ring is pro vided with internal teethforming a -partcircular rack, meshing with the correspond- .ingtoothedsectors of leversip'ivoted upon the supporting disc, ea'ch'ofsaidlevers be ing formed orprovided with a weighted arm lyingto one side ofthepivot'.

" The'ring has one edge notched to form cam surfaces engaging internalprojections; from w a slidable cover which in the preferredapplicationof the inventionaifords one member of a variable friction gear. 1

The invention ishereafterdescribed reference tothe accompanyingdrawings, in which: 1. -Z"

Figure 1 is an end view of the supporting disc and rotatable ring, withthefslidable cover removed to show the governor weights.

- Figu re2 is a sectional elevationgviewed at right angles toth'ejline 220f Figure I, 3

40 Referring toFigure 1, thereismounted' upon the driving shaftwadiscorfcasing supporting a rotatable cage in the form of. acylindrical ring f. A pair of governor: flevers g are pivoted at gu'pon'the disc 6, these levers each consisting for example 0f twosimilar stamped metal platesprovi'ded with toothed segments g andpressed upon: the shouldered ends of a sleeve g ,"fitted uponthe pivot 9the freeends of the plates being con nse ted by apinorrivet? on which,is

' over the disc I).

The driving'connection between the 'casn key's'e may be "employed forthisflpurpose,

"force the slidable cover 0 outwards away illustrating the applicationofltheinvention i p weighted levers dependent upon the speed ofrotation,there may be utilized an inertia ef- .mounted weight g. Thetoothedsegments of thegovernor levers g inesh with part-circular-ra'cksf o'nthe interior of the cage-ring 7", so that asthe weighted ends ofthe levers move-outwardlythesegments g produce a relativerotatlonor'advance of the cage-ring As illustratedin Figures 2 and 3,the rotatable'cage-ring f is formed with a series of cam-shaped notches)upon its outer edge, each of these notches engaging with a roller 6fitted upon a stud e carried by an outer coveri c which is heldtowardsthe casing b bysprings'd the endof this cover is formed by a.dished or conical plate 0 acting as one member of thefriction gear, andthe rim of .thecover fits around the casing b,"'the rollerprovided studse vpassing through slots b 1n the outer wall of the casing I ing];andthecoverjcfisconstituted for examplebythe studs 6 passingthroughtl-ie slots in the casing, 01' other means" such as these. keysbeing secured by the'stud's e as shown in-Figures? The expandingmovement of the weighted levers g as' the speed of the casing increases,willthen cause the rotatablecage-ringf to from the casing, against therestraint of the controlling springs cl, by. the engagement of thecam-shaped notches f? with the roller fitted studs. V r

In addition to the centrifugal effect of the fectdue to the tendency ofthelever weights to lag'behindtor toovertake the disc' b ias the speedof the latter-varies in acceleration or retardation of thedriving'shafta. This inertiaefiect will produce a force acting approximately atthecenter of the weight '9 around the pivot g In thepositionshown' lI LEiglr9ll he inertia force due tosacceleraiee conditions, for example byplacing the Weighted ends of the governor levers upon A governor compring, a rotary casing;

the opposite sides oi the pivotsgnot limited to the particularapplication de scribed; for example themechanism may be employed for anengine-shaft-gevernor controlling the angle of advance otan eccentricoperating the slide valve of a steam engine, or for regulating theadvance of therQqnta h;

breaker of an ignition magneto for an internalcombustion eng n l 0 Whatlcz -a mgise annul r m mber mo a eel'e ce tr ea ly wi hin sal lcasmg'ndbapable i a gul r movemen in re ation th eto, a'ple ali y of weightedlevers pivoted upon saidcasing and .interiorly'of said annularmembeneach of i-said levers including a toothed secton said' annular-\mBIIIbEI; having internal teeth mesh;

ing with the toothedsectors of said levers, the centers oi, gravity ofsaid levers being so disposed in relation to their; respective inlcrathatsaid sectors. co-operate in produ'cingan gularmovement of saidannular member as resultet centrifugal force, and resilient smeans foropposing the angular movement "o sai an u ar m ber 2. A governorcomprisinga rotary casing, a l-annular member mounted concentricallywithin said casing and capable, of angular movement in-relation thereto,a plurality of we ght d spivo ed. upo d asin and interior ly of saidannular ;member,- each of said levers includingj atoothed sector, saidannular member having internal; teeth mesh- -inggwith the toothedsectors of said levers,

the centers of gravity ofsaid levers beingso disposed in relationtotheir respective fulcra that said sectorsco-operatefin producing angularmovement of said-annular member as a resu-ltlof centrifugal force, acover mounted upon the exterior of said casing and. capable of axialmovement in relation thereto, cam-surfaces formed upon said; annularmember, means carried by said cover for en- ..gaging said cam-surfaces,said cam-engaging means transform ng the angular movement of saidannular. member into axial" movevment of said cover, and resilient.means con necting said cover to said rotary support. to oppose themovement of said-flcover; away 1 from saidsupport, said resilient meanslike- .wise OPPOSlIlgthG, angular movementv of said annular memberand'the pivotal movement of said Weighted levers Luntil'the centrifugaliorce r es a p d t rmined val e? .3. A governorcomprisinga rotarycasing, a coverslidablymounted upon said casing,

an annular i member mounted concentrically 7 said levers including atoothed sector, said annular member having internal teeth meshingwith-the; toothed sectors of said levers,cam- It will be. understoodthat the invention is surfaces formed. upon oneedge oi said annularmember, internal pro ections upon said silidslidable cover to saidcasing.

' 4. A governor comprising a rotary casing,

ageo er sliclably mounteld upon sai c si g, an annular member mountedconcentrically Withinsaid casing and c pable angu movement: inarelationther to, a pl ality of weighted levers pivoted upon saidcasingandinteriorly ,ofi-said annu ar member,'each'of saidieversincludingatoothedseotonsaid nular member having in ernal teeth m shes with the'tootb sectors of said, levers, camsurfaces formed upon one edge of;Said annular member, internal projections upon said slidable cover,saidfprojections extending through slots said casingr and engaging withsaid cam surfaces, said pro ections and slots serving to guide saidcover its sliding s movement over said; oasingand'also to transnntrotary motion from sa d caslng to said 's i ble cover, and sp ingsconnecting said slidable cover. to said casing.

5. A governor comprising a otary a in a coverslidablymounted upon saidcasing, a annular jqmemb 'r moun ed] nc ntrically within said casing;and capable of angular movementin-relationth r to, a plur li y ofweighted levers. pivoted upon. said cas ng an interiorlyzoisaid annulamember, ach o said levers including toothed: sector, said annularmemberhavifng internal teeth meshi g wi h thetoothecl.sectors'of saidlevers,

cainesurfacjesformed-upon one edge of, aid

annular member, internal projections upon said slidable cover, saidprojections extendingthroug l slots insaidcasing nd. ngagingwith. said0am surfaces, and prings onnecting said. slidalole cover to said; casingwherebyto oppose the move e of aiclslidable cover away from; saidcasing, to maintain said projec ions engagement wi h said cam-surfaces,and t retain saida n la member in a position. with said W ghted 1eversheld inwardslmtil the centrifugal force reaches apre-determined value.

6; A governor comprising arotary cas ng, :a-cover slidably-mounted uponsaid casing,

an anlnllarv memberv mounted concentrically Within saidcasing andcapable Qf'angular movement; lnfrelation thereto, a plurality ofvveightedlevers pivoted uponsaid casing and alnteriorly-ofzsaid annularmember, each of said leversincluding a-toothedsector, said annularmember having internal teeth meshing-vvith the toothed sector of said;levers,

tatably against the bottom of said casing, the

cam-surfaces formed upon one edge of said annular member, internalprojections upon said slldable cover, sa1d pro ect10ns1nc1ud1ng rollersengaging with said cam surfaces and driving keys engaging with slots insaid casing, and resilient m eansconnecting said slidable cover to saidcasing.

7. A'governor comprising arotary casing,

a cover slidably mounted upon the exterior of said casing, said coverhaving a Conical face forming an axially displaceablemember, acylindrical ring mounted in the interior of said casing, one edge ofsaid ring resting roother edgeof said ring being formediwith cam-shapednotches,v a plurality of Weighted levers pivoted upon the bottom, ofsaid casing and within said ring, each of saidlevers including a toothedsector, said ring having internal teeth meshing with the toothed sectorsof saidlevers, projections'upon the im terior of said cover,saidprojections engag ing slots in the outer wall of said casing, rollerscarried by said projections, said rollers being internal of said outerwall and in posiv tion to engage with the cam-shaped notches upon saidring, and springs arranged between i the bottom of said casing and theconical face i of said cover to hold said covertowards the bottom ofsaid casing.

In testimony whereof I; hereunto afiix my signature.

JOHN HOGG ROBERTSON.

